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Start learning 50% faster. Sign in nowA: Here, a verb is correct. ‘Centred’ is a verb and it is correct here. The phrasal verb ‘centre on something’ means ‘to have something as the main subject of discussion or interest’. B: Here, an adverb is correct because, without the word, the sentence is correct and the word before the verb should be an adverb. So, ‘explicitly’, which means ‘in a way that is clear and exact’ is correct here. C: Here, a noun should be used. The word ‘repudiation’ is a noun, which means ‘the act of refusing to accept something or someone as true, good, or reasonable’. It is correct here. So, option 4 is correct.
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